Drill-chuck.



F. WIARD.

DRILL CHUCK.

APPLIGATION FILED MAR. 25, 1911 1,056,076. Patented Mar. 18, 1913.

UNITED STATES PATENT OFFICE,

ranpn'mcx wrann, or nnrnox'r, urcnrean.

DBILL-GHUCK.

To all whom it may concern:

Be it known that I, FREDERICK WIARD, a citizen of the United States, residin at Detroit, in the county of Wayne, tate of Michigan, have invented certain new and useful Improvements in Drill-Chucks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

This invention relates to drill chucks, and consists in the construction and arrangement of parts hereinafter more fully set forth and pointed out particularly in the claims.

The object of the invention is to simple and eflicient means for enab ing an operator to readily effect a change of tools without stopping the machine; for efi'ecting a secure and positive drive for the tool without undue wear on the driving parts; for obviating wabbling and enabling a tool to be at all times properly centered for close work, and for obviating the battering up of the spindle by the use of a drift pin and hammer, as commonlypracticed.

The above object is attained by thev structure illustrated in the accompanying drawings, in which Figure 1 is an elevation showin my improved chuck in the socket of a spindle and a detachable collet in the chuck carrying the drill or tool. Fig. 2 is a sectional view showing the collet locked in the chuck. Fig. 3 is a similar view showing the collet unlocked and made free to drop from the chuck by the lifting of the locking sleeve. Fig. 4 is a transverse section, as on line 4.4 of Fig. 2. Fig. 5 is an elevation of the collet, the drill being broken away. Fig. 6 is an elevation of the chuck with its locking sleeve and rotatable collar removed.

Referring to the characters of reference, 1 designates the spindle of a drill or anal ogous machine into which is inserted in the usual manner the shank 2 of the socket 3. Formed in the wall of the 'socket are the opposed transverse apertures 4 in which are located the hardened steel locking disks 5. These disks are provided with axial trunnions 6, and formed in the sidewalls of the transverse apertures 4 are the channels 7 Specification of Letters Patent.

Application flied March 25, 1911.

rovide Patented Mar. 18,1913.

Serial No. 016,811.

which extend inwardly from the periphery of the chuck but do not ass through the nner wall thereof. The disks are inserted in the apertures 4 from the outside with the trunnions 6 thereof lying in the channels 7, as clearly shown in Fig. 4, the bottoms of said channels forming abutments for said trunmons to prevent the disks passing .through into the interior of the chuck, but

allowing their peripheries to project thereinto, as shown.

Mounted upon the exterior of the chuck to reciprocate longitudinally is a sleeve 8. Formed in the inner wall of said sleeve at its lower end is a circular concavity 9 shaped to conform to and adapted to receive a portion of the periphery of the disks 5 when -said sleeve is raised to theposition shown in Fig. 3. The sleeve 8 is limited in its vertical movement on the chuck 3 by reason of a stop screw 10 (see Figs. 2 and 3), which is 'set into the chuck and lies in a vertical slot 11 in said sleeve, the length of which slot limits the vertical movement of the sleeve upon the chuck. The engagement of the screw inthe slot of the sleeve 8 causes said sleeve to turn with the chuck. Upon the exterior of the sleeve 8 is a loose rotatable collar 12 formed preferably of brass and having a knurled surface. This collar is let into an annular recess in the sleeve and is held in place by a ring 13. which is slipped sleeve when the chuck is in motion, for the purpose of raising it to release a tool, as hereinafterexplained. A drill 15, or other tool, is detachably held within the socket by mounting upon the tapered tang or shank 16 thereof a collet 17 of slightly less diameter than the bore of the chuck. Formed in opposite sides of the collet 17 are the recesses 18 adapted to receive the peripheries of the disks 5 and having straight sides to be engaged by the sides of said disks.

To place a tool in the chuck, the sleeve 8 is raised to the position shown in Fig. 3, allowing the locking disks 5 to pass outwardly into the circular concavity ,9 in the lower ,end of said sleeve, when the collet 17 carrying the tool to be used, may be freelyinserted in the chuck. The arrangement of parts is such that when the collet is fully v inserted in the chuck, the recesses 18 therein will register with the apertures 4 in the Wall of the chuck in which the disks 5 lie so that upon releasing the sleeve 8 and allowing it to fall, said disks will be crowded inwardly into the recesses 18 in the collet and locked therein by the embracing wall of the sleeve, which, when in the lower position, as shown in Fig. 2, bears against the rangement avoids periphery of the locking disks, whereby the collet and its tool become securely locked in the chuck and will be caused to revolve therewith when the spindle is turned. To release a tool from the chuck, it is only necessary to raise the sleeve 8, thereby freeing the disks 5 and allowin them to move outwardly into the recess 9 1n the sleeve as the released collet drops from the chuck by gravity. -When in the locked position, as shown in Fig. 2, it is impossible to remove a tool from the drill without first raising the sleeve 8 to release the lockin disks.

Because of the fact that the at faces of the locking disks 5 engage the straight side walls of the recesses 18 in driving the collet,

wear between said parts is obviated and excessive lost motion is overcome. This arany wedging strain against the lockin disks and prevents them from being crowdled outwardly against the resisting wall of the sleeve 8 which bears against their outer peripheries. when the parts are in the locked position, as shown in Fig} 2.

avin thus fully set forth'my invention, what I .desire to secure by by thestraight face of said disk, a sleeve slidable upon the chuck adapted to cooperate with said lockingdisk in the locked position to crowd it into the recess in said collet, and a collar rotatably mounted on said sleeve for manipulating 1t.

3. The combination of a chuck, a locking disk movable through thewall thereof, having a straight engaging face, a collet insertible in the chuck having a recess adapted to receive said locking disk, and having a straight side adapted to be engaged by the straight face of said disk, and a sleeve shdable upon said chuck, mainly of the same diameter of the chuck and adapted to cooperate with said locking member in the locked positionito crowd it into the recess 1n said collet, said sleeve having-at its lower end a circular recess to receive said locking disk when raised.

4. The combination of a-chuck, havin an opening in the wall thereof, a locking lsk movable transversely of said opening having trunnions thereon projecting laterally 1n the plane of its axis, the side walls of the opening in the chuck havin channels to receive said trunnions, a col et insertible n the chuck havin a recess to receive said locking disk, an a sleeve slidable on the chuck cooperating with said disk to hold it locked in the recess of the collet.

"In testimony whereof, I signthis specification in the presence of )wo witnesses.

FREDERICK WIARD. 

